# Member of Technical Staff - Sandbox Service

**Company:** [xAI](https://hotfix.jobs/companies/xai)
**Location:** London, United Kingdom
**Role:** Backend Engineering
**Salary:** £107k – £262k/yr
**Skills:** Rust, C++, Go, Python, Linux, Windows, Virtualization, Containerization, Kvm, Gvisor, Qemu, Networking
**Posted:** 2026-08-13

> Build and maintain secure sandbox infrastructure that lets AI models execute code and interact with tools in controlled virtualized environments. The role requires expert Rust, C++, or Go skills, systems expertise, and experience with containers, virtualization, and networking.

## Job Description

## Responsibilities

- Build and maintain a secure, scalable sandbox system that gives AI models controlled access to computational environments.
- Provision containers and virtual machines on large-scale clusters.
- Enable models to run code, build software, interact with tools, and control applications with user interfaces.
- Orchestrate large-scale jobs and resource scheduling at the cluster level.
- Tune filesystem performance on compute nodes.
- Support real-time code execution for user queries and reinforcement learning workloads involving interactive tool use.

## Requirements

- Expert knowledge of **Rust**, **C++**, or **Go**.
- Familiarity with **Python**.
- Deep experience with **Linux** or **Windows** systems; familiarity with both is a strong plus.
- Experience with virtualization and containerization technologies such as **cgroups**, **KVM**, **gVisor**, and **QEMU**.
- Solid knowledge of the networking stack.

## Compensation and Benefits

- Base salary: **£107,000–£262,000 GBP**.
- Equity.
- Comprehensive healthcare and dental coverage.
- Cash plan.
- Income protection.
- Life insurance.
- Various other discounts and perks.

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